KOJIMA PROJEXT "NEXT"
Joystiq.com: Kojima website updates with countdown and mysterious "5"
1up.com: Kojima Productions Teaser Site: Is That A "5"?
IGN.com: MGS5 Announcement Coming This Week?
The webpage source code reveals only these clues: "Hideo Kojima, MGS,METAL GEAR, NEXT, game, konami, kojima game, KJP, Kojima Production"
Thunder and lightning? Is it Raiden? Is it all just a ruse? Might this end up being an entirely different IP? Stay tuned!